Study of Mesobeta Basin Flows by Remote Sensing |
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Authors: | J Cuxart J Cunillera M A Jiménez D Martínez F Molinos J L Palau |
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Institution: | 1.Grup de Meteorologia, Departament de Física,Universitat de les Illes Balears,Palma,Spain;2.àrea de Recerca i Modelització,Servei Meteorològic de Catalunya,Barcelona,Spain;3.àrea de dinàmica de contaminants,Centre d’Estudis Ambientals del Mediterrani,Valencia,Spain |
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Abstract: | If no well-defined synoptic pressure gradients exist over a basin, flows can develop at a variety of scales, the main generators
of circulations being spatial thermal differences. These dynamics are studied for the eastern Ebro basin, at the north-eastern
part of the Iberian Peninsula, almost isolated from the surrounding areas by mountain ranges. The main tool for the study
is the new RASS-Sodar by Scintec, the WindRASS, which combines sound and radio waves to provide profiles of wind and virtual
temperature up to 360 m above the ground in the present configuration. One year of operation shows that low-level jets are
found routinely, their maximum speed being at a height below 500 m above ground level. The jets are from a constant direction
for several hours over the whole observed column, with rapid transitions between these periods. They allow for efficient heat
transport at the basin scale and are good producers of vertical mixing due to the strong wind shear. In summer the irrigated
plain has larger thermal contrast with the dry slopes, and the winds are stronger than in winter, when katabatic flows can
develop at night and usually radiation fog appears and may last for days. |
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